﻿using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Example52
{
    class Polygon
    {
        protected int width, height;
        public void SetValues(int a, int b)
        {
            width = a;
            height = b;
        }
    }
        class Rectangle : Polygon
        {
            public int area()
            {
                return (width * height);
            }
        }
        class Triangle : Polygon
        {
            public int area()
            {
                return (width * height / 2);
            }
        }

    class Program
    {
        static void Main(string[]args)
        {
            Rectangle rect = new Rectangle();
            Triangle trgl = new Triangle();
            rect.SetValues(4,5);
            trgl.SetValues(4,5);
            Console.WriteLine("rect a:{0}",rect.area());
             Console.WriteLine("trglb:{0}",trgl.area());
             Console.ReadLine();
        }
    }
}